Thomas Harte
43a7d1b7ae
It'll be helpful to be able to isolate the tape interface when I'm faking a fast load. So factored out.
2016-01-23 00:14:44 -05:00
Thomas Harte
0efe4b312c
Disabled my various bits of rate interchange debugging; improved test for when to call update_display due to a RAM write.
2016-01-21 22:16:52 -05:00
Thomas Harte
82cb1c365c
Further simplified inner loops.
2016-01-21 21:35:04 -05:00
Thomas Harte
34640cec93
Started trying to move some logic out of the inner loop.
2016-01-21 21:28:09 -05:00
Thomas Harte
48ddd3c497
Set about documenting the CRT; while doing so decided to add an optional clock divider for input; having done so decided to try to exploit it with the Electron.
2016-01-21 21:17:47 -05:00
Thomas Harte
de7218cdf0
Added a lot of commenting to the CPU6502 definition, simplifying its construction. Added missing nullability modifier to CSElectron. Fixed bad-habit Objective-C style naming on the Electron's Interrupt enum.
2016-01-20 21:55:38 -05:00
Thomas Harte
4c16d34063
Moved set_tape so that the inline definition of get_next_tape_pulse is visible to it. Also eliminated some dead typedefs.
2016-01-20 08:27:25 -05:00
Thomas Harte
280a2292ff
Shushed.
2016-01-19 23:33:15 -05:00
Thomas Harte
9036cf3b7c
Thus did the first UEF load.
2016-01-19 23:03:27 -05:00
Thomas Harte
e65cd4cf06
Some data is marginally reaching the CPU from the tape.
2016-01-19 22:05:34 -05:00
Thomas Harte
956b90e203
Attempted further to improve latency; added view adjustment for non-4:3 output aspect ratios. The 4:3 is currently hardcoded, so further work will be required.
2016-01-18 23:55:52 -05:00
Thomas Harte
e63b6d22ae
As shown by the commented-out code, the aliasing-adaptation seems to be working. So something is wrong somewhere else.
2016-01-14 21:59:37 -05:00
Thomas Harte
383b2be4c6
Fixed one off-by-one error.
2016-01-14 21:33:27 -05:00
Thomas Harte
8bd04a6be4
Switched model for filter subclasses. Implemented test square[-ish] wave to check for obvious stream errors. None is clear.
2016-01-14 21:27:02 -05:00
Thomas Harte
38ffcaa262
Here, at last, is _some_ audio output, at least.
2016-01-14 20:33:22 -05:00
Thomas Harte
439d452e23
Resolved some errors.
2016-01-13 22:11:33 -05:00
Thomas Harte
49e89a4bcb
I'm not yet completely convinced by my approach to time basing, but it'll probably do? If so then this more or less gets me ready for a point-sampled filtering.
2016-01-13 22:02:39 -05:00
Thomas Harte
d9a7ef9e46
Edging towards audio output; the speaker is given appropriate input and output rates, and then updated with current divider and enabled/disabled status.
2016-01-13 21:03:43 -05:00
Thomas Harte
d28abdc037
Made an attempt at correct timing, adding support for additional paged ROMs, added file association for .rom.
2016-01-12 22:34:26 -05:00
Thomas Harte
84ba4e2900
Tidied a little, started working towards supporting speaker output.
2016-01-12 22:19:56 -05:00
Thomas Harte
75d6ec354b
Added some very basic filtering in RGB mode.
2016-01-12 16:27:09 -05:00
Thomas Harte
cba09b5490
Switched display update and RAM write order.
2016-01-11 22:29:16 -05:00
Thomas Harte
650077feac
Pulled a few things out as constants, zoomed in a little. Still in a 4:3 window though.
2016-01-11 22:18:34 -05:00
Thomas Harte
72019d0ea3
Made an attempt to get video output correct.
2016-01-11 22:08:30 -05:00
Thomas Harte
e93dbdb463
Implemented keyboard input.
2016-01-11 19:48:31 -05:00
Thomas Harte
ce916ebd6a
Fixed runaway frame generator.
2016-01-10 23:32:57 -05:00
Thomas Harte
ccf20299a3
Made an attempt at getting some interrupts all up inside this thing.
2016-01-10 19:06:46 -05:00
Thomas Harte
cc5ba8243e
Fixed: turned out the power-on bit was being cleared.
2016-01-10 17:17:39 -05:00
Thomas Harte
d95414b2eb
I'm not really sure what's going wrong with paging yet but this fixes the 0xc000 byte error.
2016-01-10 12:30:24 -05:00
Thomas Harte
e07981c147
Fixed screen start address.
2016-01-09 22:52:08 -05:00
Thomas Harte
1308332a71
Hard-coded to 40 columns of black and white, here's some text, at least.
2016-01-09 22:39:46 -05:00
Thomas Harte
037602765a
This now correctly (I think) decodes information posted to the CRT. But doesn't yet post it correctly. I'm very close now, I hope.
2016-01-09 22:19:00 -05:00
Thomas Harte
07a041d788
Fixed vertical retrace sync.
2016-01-09 21:54:31 -05:00
Thomas Harte
3d6f20b7b9
Output, at last! Though sync is clearly way off.
2016-01-09 21:53:33 -05:00
Thomas Harte
b4f31edea3
Made an attempt to get RGB output mode up and running, and showing at least a box where pixels would be.
2016-01-09 21:32:56 -05:00
Thomas Harte
a900bfed65
Fixed to ensure that frame rendering wraps around, and to properly connect the Electron to its view. Now I need a working pixel shader.
2016-01-09 20:34:22 -05:00
Thomas Harte
7341f5c341
This is intended to be enough to start producing something of an output. But something's obviously still broken.
2016-01-09 20:26:40 -05:00
Thomas Harte
716bb3281b
This at least now connects up a CRT, though it never talks to it.
2016-01-07 22:26:49 -05:00
Thomas Harte
47a7654c00
Added just enough that this is probably a successful boot. I guess I'm going to need to get invested in graphics next? Hmmm.
2016-01-07 21:01:13 -05:00
Thomas Harte
8c1bfa5a05
This is the bare minimum to prove that the ROM is trying properly to boot.
2016-01-07 20:36:27 -05:00
Thomas Harte
0db8938d27
Added the option for the CSCathodeRayView to show only a subsection of the full scan area. Zoomed in a little on the 2600. Put in enough piping to give the Electron sight of its ROMs at least.
2016-01-06 23:14:36 -05:00
Thomas Harte
bfd9957c81
You now get an Electron only if you ask for a new file. That'll do for now while it's the only thing that one might want to start without supplying a file. The 6502 now starts from a defined point — being reset. The Electron is starting to grow the absolute most simple buds of its memory map.
2016-01-06 21:09:49 -05:00
Thomas Harte
ab45c1d530
Started working on a shell for the Electron emulation, including factoring out the common CRT delegate -> Objective-C bridging, serial dispatch queue and frameskipping logic from the Atari 2600 shell.
2016-01-04 23:12:47 -05:00
Thomas Harte
675070c5dd
Very, _very_ minor: switched to normal C++ constructor syntax for simple variable initialisation.
2015-12-06 16:53:37 -05:00
Thomas Harte
5d6bee4927
Of course, being in-phase means being the cosine wave.
2015-09-10 21:30:39 -04:00
Thomas Harte
82aa6d074a
'type' is out, at least for the time being.
2015-09-05 20:25:30 -04:00
Thomas Harte
7fb6c86d9d
Okay, it looks like colour 3 is approximately phase offset 0, and the palette wraps around after 14 entries, not 16. Also got a bit less dependent on floating point accuracy for the step.
2015-09-05 17:10:41 -04:00
Thomas Harte
80cf3d9301
Formally gave the 2600 responsibility for providing the code that decodes one of the things it has put into a buffer into a composite sample.
2015-09-03 12:28:16 -04:00
Thomas Harte
ac8fc9a1a0
Experimenting with pre-encoding luminance and chrominance separation over on the
...
CPU as otherwise the GPU does them repetitively and more awkwardly (as it's working purely in floats). It means uploading twice as much data though, so I don't
know. Still only half as much as the RGBA path of a few days ago. Will experiment.
Also slightly adjusted division of responsibility in the fragment shader per the
desire to have the `sample` function owned externally.
2015-09-03 11:15:23 -04:00
Thomas Harte
cb6e6e8acb
It's the worst fragment shader you'll ever see. The worst. But this attempts NTSC composite video emulation, artefacts included.
2015-09-01 22:36:45 -04:00
